/*******************************************************************************
 * Copyright 2006, 2017 Jerry Huxtable, Martin Davis
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * This file was semi-automatically converted from the public-domain USGS PROJ source.
 */
package org.locationtech.proj4j.proj;

import org.locationtech.proj4j.ProjCoordinate;

public class Eckert5Projection extends Projection {

	private final static double XF = 0.44101277172455148219;
	private final static double RXF = 2.26750802723822639137;
	private final static double YF = 0.88202554344910296438;
	private final static double RYF = 1.13375401361911319568;

	public ProjCoordinate project(double lplam, double lpphi, ProjCoordinate out) {
		out.x = XF * (1. + Math.cos(lpphi)) * lplam;
		out.y = YF * lpphi;
		return out;
	}

	public ProjCoordinate projectInverse(double xyx, double xyy, ProjCoordinate out) {
		out.x = RXF * xyx / (1. + Math.cos( out.y = RYF * xyy));
		return out;
	}

	public boolean hasInverse() {
		return true;
	}

	public String toString() {
		return "Eckert V";
	}

}
